An essay to prove that the jurisdiction and conservacy of the River of Thames, [electronic resource] : &c. is committed to the Lord Mayor, and City of London, Both in Point of Right and Usage, BY Prescription, Charters, Acts of Parliament, Decrees, upon Hearing before the King, Letters-Patents, &c. &c. To which is added. A brief Description of those Fish, with their Seasons, Spawning-Times, &c. that are caught in the Thames, or sold in London. With Some few Observations on the Nature, Element, Cloathing, Numbers, Passage, Wars, and Sensation, &c. peculiar to Fish in general. And, Also, Of the Water Carriage on the River Thames, to the several Parts of the Kingdom; with a List of the Keys, Wharfs, and Docks, adjoining to the same. By Roger Griffiths, Water-Bailiff.